Abstract
We measured temperature-dependent resistivity of a CeSi single crystal under several magnetic fields in order to study the effect of the magnetic field on the spin fluctuation in the commensurately modulated antiferromagnetic state of CeSi. Resistivity under each magnetic field exhibits a clear T2 dependence at low temperatures. The coefficient A of T2 term decreases monotonously with increasing magnetic field. The residual resistivity at 0 T is steeply reduced around 1 T, and almost constant above 1 T. Temperature dependence of the magnetoresistivity near TN is compared with that of the isothermal change in the magnetic entropy.
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